JPS586053B2 - Ekireinainenkikan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method in which a number of cylinders are aligned and several pairs of intake and exhaust valve seats for each cylinder are arranged substantially in line along the length of the cylinder head. Related to liquid-cooled internal combustion engines.

The disadvantage of high-speed diesel engines is the “valve bridge” (
The area of the cylinder head known as the Valve bridge, the portion of the metal that forms the bulkhead between the poppet valve seats, is susceptible to cracking.

Other areas of the cylinder head that are susceptible to cracking are usually localized to high temperature areas.

The object of the invention is to improve the cooling in the area of the fragile bridge of the cylinder head with the intake and exhaust passages leading to the intake and exhaust valve seats in the cylinder head and cylinder block of a liquid-cooled internal combustion engine. It seeks to provide a system of chambers and passageways for the flow of coolant.

If cooling is not effective, cracking can occur in hot spots within the area of the bridge.

The purpose of this is to provide two longitudinally extending coolant chambers in the cylinder head and to connect them via a straight coolant passage 42 to cool the sensitive bridge-like area between the intake and exhaust valve seats. This is achieved by a direct connection so that all cooling cuts are conducted from the first chamber to the second chamber.

Coolant is supplied directly from a third coolant chamber in the cylinder block through paired holes in the block and head.

The invention will now be described in conjunction with the accompanying drawings.

Two major components are shown in FIG. 1: cylinder flock 10 and cylinder head 12.

The block 10 is made of cast metal and has a cylinder 14 formed therein.

The liquid coolant enters the block through openings 16.18. A split feed pump 17 is used to circulate the cooling shavings, for example 2/3 of the flow enters opening 16 and 1/3 enters opening 18. do.

Flow through the opening 16, indicated by the double-headed arrow, enters the third coolant chamber 20 and circulates around the cylinder 14, opening the hole 2.
It flows upstream through 2 and 24.

Coolant entering the opening 18 is shown by a single headed arrow and flows along a duct 26 adjacent to the side of the top of the cylinder 14.

The duct 26 is tapered along its longitudinal direction,
Therefore, any coolant flowing therein is forced upwardly through the holes 28 and the rear cylinder side inlet holes 30.

A hole 30 connects the duct 26 with the third chamber 20 in the vicinity of the rearmost cylinder 14r, ensuring cooling circulation around the cylinder 14r.

Cylinder head 12 is shown spaced above block 10 for convenience of illustration, and valve gears, bolts, injectors, etc. mounted on the head have been omitted to clearly show coolant flow.

As shown, the head 12 has two coolant chambers, namely:
It is divided into a first coolant chamber or front chamber 32 and a second coolant chamber 34 .

The holes 36 in the floor of the vestibule 32 overlap the holes 22 in the block when the head and block are assembled, and the pair of holes 22 and 36 between them define the vestibule inlet holes 22,36.

Similarly, holes 38 in the floor of second chamber 34 overlap holes 24 to form coolant inlet holes 24.38, which in turn overlap holes 40 and together form duct outlet holes 28.40.

The purpose of the tapered duct 26 is to further cool the head by supplying coolant to the upper second chamber 34 via the duct outlet hole 28.40.

The duct 26 also directs the coolant to the rear inlet hole 30 of the duct 26.
and into the third chamber 20 surrounding the cylinder, which helps cool the rearmost cylinder 14r.

The coolant entering the third chamber 20 through the opening 16 cools the front cylinder and gradually increases in temperature before cooling the rearmost cylinder, so that the rearmost cylinder is not effectively cooled, but the opening 18 The cooling cuttings entering the duct 26 through it are directed directly to the rearmost cylinder, thus ensuring that this cylinder is effectively cooled.

Coolant enters the vestibule 32 only through the vestibule inlet holes 22,36.

A passage 42 per cylinder formed in the side wall of the front chamber 32 allows coolant to flow from the front chamber into the second coolant chamber 34 .

The passageway 42 is specially shaped and located as described in more detail below, but is generally proximate to the "valve bridge", i.e., the portion of the cylinder head that separates the intake and exhaust valve seats from each other. will be placed.

A jet of coolant emanating from coolant passage 42 is preferably directed into a combustion chamber or interior sector, as described below.

All coolant flows from the coolant passages 42, the coolant inlet holes 24.38 and the duct outlet holes 28.40 mix and merge in the second coolant chamber 34 and exit from the cylinder head to the opening 4.
4 to the coolant radiator.

The first coolant chamber 32 is a single chamber that is connected to all coolant passages 42 and supplies coolant to each coolant passage at the same pressure to equalize the cooling cutting pressure. It is designed to let you do so.

FIG. 2 shows a cross section of the upper portion of an actual engine structure embodying the invention.

Numbers in FIG. 1 are used to identify similar parts.

As can be particularly seen, flow enters the vestibule 32 from the chamber 20 through the vestibule inlet hole 22.36.

The coolant passages 42 are formed by drilling from the outside of the head 12 and in this case pass through the prechamber 32 through the space for the pushrod and into the pre-combustion chamber (anlecha).
In front of the outer wall 50 of the combustion chamber 52, the combustion chamber 52 is of the type Mber) and merges with the second coolant chamber 34.

Drilling is done with plugs 54 and 56.

FIG. 3 shows the general alignment of the front chamber 32 as it passes below the intake air passage 58 and the exhaust gas passage 60.

The duct outlet hole 28.40 is longitudinally displaced from the combustion chamber and is shown in partial section in FIG.

As is apparent from FIGS. 2 and 3, passageway 42 includes valves, seats 64 . 6 passes closely over the bridge 62 between the passages 42 and is further positioned such that the coolant emanating from the passages 42 impinges on the walls 50 of the combustion chamber.

Duct outlet holes 28.40 supply coolant to the opposite side of the combustion chamber.

Another type of prechamber is shown in FIG.

In this case, the hot gas discharged from the outlet 68 is guided by a groove 70 formed in the wall 72 of the cylinder head.

This area of the cylinder head is subject to intense local heating and it is advantageous for the jet of coolant exiting the passages 42 to pass over this area.

Figure 5 shows the so-called "cross flow"
The invention is shown applied to a mold cylinder head 74, with air being drawn in from one side of the head through inlet holes 76 and exhaust gas being exhausted from the other side through exhaust holes 78.

As shown, it is not necessary that the jets emanating from the coolant passages 42 impinge on hot parts.

FIG. 6 is a cutaway perspective view of the direct injection engine.

In this case, the copper injector sleeve 82 that holds the injector in place is cooled by the coolant exiting the coolant passage 42.

The injector itself has been omitted for clarity.

The present invention is constructed as described above, so that it can be used in the fragile bridge-like area of the cylinder head of an internal combustion engine, i.e.
This makes it possible to eliminate or reduce metal cracking in the valve bridge area.

Embodiment 1 A duct 26 is disposed extending longitudinally on the opposite side of the engine from said first coolant chamber 32, and a plurality of pairs of holes 40.28 in said head and duct are respectively overlapping each other to direct the coolant from the duct 26 to the head 1.
2. A liquid-cooled internal combustion engine according to claim 1, wherein said second coolant chamber 34 in said second coolant chamber 34 passes over its entire length.

Embodiment 2 A liquid-cooled internal combustion engine according to embodiment 1, comprising a coolant circulation pump 17 connected to said duct 26 and said third coolant chamber 20 to provide separate flows of coolant thereto.

Practical Embodiment 3 A liquid-cooled internal combustion engine according to embodiment 2, wherein the duct 26 tapers along its entire length from the coolant inlet end.

Embodiment 4 A liquid-cooled internal combustion engine as claimed in the claims, wherein the air passage 58 and the exhaust gas passage 60 are formed on one side of the cylinder head 12.

Practical Embodiment 5 The liquid-cooled internal combustion engine according to Embodiment 4, wherein the first coolant chamber 32 passes under the air passage 5B and the exhaust gas passage 60.

[Brief explanation of drawings]

FIG. 1 is a diagram of the cylinder block and head showing the coolant flow paths. FIG. 2 is a cross-sectional view of a portion of an engine having one form of indirect combustion chamber. FIG. 3 is a sectional view taken along the line ■--■ in FIG. 2. FIG. 4 is a detailed sectional view similar to FIG. 2 showing another form of indirect combustion chamber. FIG. 5 is a view similar to FIG. 3 of a different type of cylinder head. FIG. 6 is a cross-section of a cylinder head suitable for a direct injection engine. 10... Cylinder block, 12... Cylinder head, 14... Cylinder, 20... Third coolant chamber, 2
6...Duct, 32...First coolant chamber, 34...Second
coolant chamber, front chamber, 42...coolant passage, 52...combustion chamber, 58...intake air passage, 60...exhaust gas passage, 6
2...Bridge.

Claims (1)

[Claims] 1 a cylinder head and a cylinder block having a plurality of air passages each terminating in an intake valve seat and a plurality of exhaust gas passages each terminating in an exhaust valve seat, each pair of said air passages and said In a liquid-cooled internal combustion engine provided with a coolant passage for passing a coolant in proximity to an exhaust gas passage, a first coolant formed in the cylinder head and extending along the longitudinal direction of the head. a chamber 32 and a second coolant chamber 34 formed within the cylinder block and extending along the length of the block so as to surround the cylinder 14 and be located below the first coolant chamber 32; a third coolant chamber 20 in the cylinder head;
and a second coolant chamber 32 , 34 at least partially lying on either side of said intake valve seat and said exhaust valve seat, said first coolant chamber 32 and said second coolant chamber 32 . The coolant chamber 34 includes a number of coolant passages 42
The third coolant chamber 20 and the second coolant chamber 32 communicate through a plurality of pairs of holes 36, 22 in the cylinder head 12 and the cylinder block 10, respectively. The coolant passages 42 are linear passages disposed adjacent to a portion of a valve bridge 62 that separates the intake valve seat and the exhaust valve seat from each other. from the third coolant chamber 20 to the holes 36.22.
through the first coolant chamber 32 and from the first coolant chamber 32 through the coolant passageway 42 and into the second coolant chamber 32 .
coolant chamber 34 and finally flows out of the cylinder head from the second coolant chamber 34 through an opening 44 and from the first coolant chamber 32.
is characterized by a single chamber connected to all the coolant passages 42 so as to supply coolant at the same pressure to each coolant passage and equalize the coolant pressures. Liquid-cooled internal combustion engine.